Both free software and open source are strictly defined terms. Most F/OSS licenses are applicable to both, but there are licenses that are only open source, but but free software and vice-versa.
this post was submitted on 19 Mar 2025
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Things like the MS-PL strike me as Open Source but not Free Software, but I can't think of a contrary example which is Free Software but not Open Source.
I read a Stack Overflow discussion about it a few years ago and if I remember correctly, they found some obscure one which was free but not open source.
Though I don't remember which one it was.
I do not think we should use the term open source
That really depends on what you're trying to convey.
"Open source" is all sbout the code, and it usually implies that it can be used for any purpose, commercial or otherwise. When I think of open source, I think of MIT, BSD, and other permissive licenses where the point is to ensure the source can be used for any purpose.
"Free software" is all about the users, and it comes with extra baggage that ensures that users will always have access to improvements by others. If it's used in a commercial project, you can demand the improvements be made available under the same terms as the library it's based on. When I think of free software, I think of copyleft licenses like GPL, AGPL, etc.
Both are valid, and generally all free software is open source but not all open source software is free software. Both are worthwhile terms, just be careful to lump non-free software (e.g. pretty much anything not copyleft) with free software if that's what you prefer.
It doesn't matter what you think. These terms have been standardised and in use for decades.
Freedom is such a vague word, we shouldn’t use this word if we want to be precise about what we mean by it.
I cannot more strongly disagree as it's very explicitly defined. Libre software is not the same as open source software even though the non-initiated equate the two.
However, I do not think we should use the term open source.
This is why most people use the term FOSS now; free and open source software. Then of course there's Libre.